1MTR(8)                                mtr                               MTR(8)
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NAME

6       mtr - a network diagnostic tool
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SYNOPSIS

11       mtr  [-hvrctglspniu46]  [--help] [--version] [--report] [--report-wide]
12       [--report-cycles COUNT] [--curses] [--split] [--raw] [--no-dns] [--gtk]
13       [--address IP.ADD.RE.SS]   [--interval SECONDS]   [--psize BYTES  |  -s
14       BYTES] HOSTNAME [PACKETSIZE]
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DESCRIPTION

19       mtr combines the functionality of the traceroute and ping programs in a
20       single network diagnostic tool.
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23       As  mtr starts, it investigates the network connection between the host
24       mtr runs on and HOSTNAME.  by sending packets with purposly  low  TTLs.
25       It  continues to send packets with low TTL, noting the response time of
26       the intervening routers.  This allows mtr to print  the  response  per‐
27       centage and response times of the internet route to HOSTNAME.  A sudden
28       increase in packetloss or response time is often an indication of a bad
29       (or simply overloaded) link.
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OPTIONS

33       -h
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35       --help
36              Print the summary of command line argument options.
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39       -v
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41       --version
42              Print the installed version of mtr.
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45       -r
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47       --report
48              This  option  puts mtr into report mode.  When in this mode, mtr
49              will run for the number of cycles specified by  the  -c  option,
50              and then print statistics and exit.
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52              This  mode  is  useful  for  generating statistics about network
53              quality.  Note that each running instance  of  mtr  generates  a
54              significant amount of network traffic.  Using mtr to measure the
55              quality of your network may result in decreased network  perfor‐
56              mance.
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59       -w
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61       --report-wide
62              This  option puts mtr into wide report mode.  When in this mode,
63              mtr will not cut hostnames in the report.
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66       -c COUNT
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68       --report-cycles COUNT
69              Use this option to set the number of  pings  sent  to  determine
70              both  the  machines  on the network and the reliability of those
71              machines.  Each cycle lasts one second.
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74       -s BYTES
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76       --psize BYTES
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78       PACKETSIZE
79              These options or a trailing PACKETSIZE on the  commandline  sets
80              the  packet  size used for probing.  It is in bytes inclusive IP
81              and ICMP headers
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83              If set to a negative number, every iteration will use a  differ‐
84              ent, random packetsize upto that number.
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86       -t
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88       --curses
89              Use  this  option  to force mtr to use the curses based terminal
90              interface (if available).
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93       -n
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95       --no-dns
96              Use this option to force mtr to display numeric IP  numbers  and
97              not try to resolve the host names.
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100       -o fields order
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102       --order fields order
103              Use this option to specify the fields and their order when load‐
104              ing mtr.
105              Example: -o "LSD NBAW"
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108       -g
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110       --gtk
111              Use this option to force mtr to use the GTK+  based  X11  window
112              interface  (if available).  GTK+ must have been available on the
113              system when mtr was built for this to work.  See  the  GTK+  web
114              page  at  http://www.gimp.org/gtk/  for  more  information about
115              GTK+.
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118       -p
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120       --split
121              Use this option to set mtr to spit out a format that is suitable
122              for a split-user interface.
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125       -l
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127       --raw
128              Use  this  option to tell mtr to use the raw output format. This
129              format is better suited for archival of the measurement results.
130              It could be parsed to be presented into any of the other display
131              methods.
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134       -a IP.ADD.RE.SS
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136       --address IP.ADD.RE.SS
137              Use this option to bind outgoing  packets'  socket  to  specific
138              interface,  so  that any packet will be sent through this inter‐
139              face. NOTE that this option doesn't apply to DNS requests (which
140              could be and could not be what you want).
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143       -i SECONDS
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145       --interval SECONDS
146              Use  this  option  to  specify  the  positive  number of seconds
147              between ICMP ECHO requests.  The default value for this  parame‐
148              ter is one second.
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151       -u
152              Use UDP datagrams instead of ICMP ECHO.
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155       -4
156              Use IPv4 only.
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159       -6
160              Use IPv6 only.
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BUGS

164       Some  modern routers give a lower priority to ICMP ECHO packets than to
165       other network traffic.  Consequently, the reliability of these  routers
166       reported by mtr will be significantly lower than the actual reliability
167       of these routers.
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CONTACT INFORMATION

172       For the latest version, see the  mtr  web  page  at  http://www.bitwiz‐
173       ard.nl/mtr/.
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176       Subscribe  to  the mtr mailing list.  All mtr related announcements are
177       posted to the mtr mailing list.  To subscribe,  send  email  to  major‐
178       domo@lists.xmission.com  with subscribe mtr in the body of the message.
179       To send a message to the mailing list, mail to mtr@lists.xmission.com.
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182       Bug reports and feature requests should be  sent  to  the  mtr  mailing
183       list.
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SEE ALSO

188       traceroute(8), ping(8).
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192mtr                              March 4, 1999                          MTR(8)